An Inland wetland of Man-made origin located in the Semi-arid Zone of the Northern province. The Giant's Tank in the north western corner of the island is a huge ancient irrigation reservoir of 3,800 hectares. The coastal sanctuaries are exotically picturesque with combinations of lagoon, swamp, river, jungle, lake and plain. Large flocks can be found here of both resident and migrant aquatic birds. It is claimed that Giant's Tank near Mannar Island was built by giants.
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